Muffler



Feb. ll, 1930. F. E. KERsl-:Y 1,747,014

MUFFLER Filed Nov. 21. 1928 v wf Wwf dwang Patented Feb,l 1l, 193@ STATES PATENT OFFICE MUFFLER Application filed November 21, 1928. Serial No. 320,894.

device of this character which will not only l) Inutile the sound of the exhaust but which will not oder any appreciable back pressure to re- Aduce the power of the motor, and which will relieve back re or other excessive pressure Without rupturing the muilier; all aswill be y hereinafter more particularly specified and claimed.

Referring to the accompanying drawings, which are made a part hereoiE and on which s similar reference characters indicate similar parts,

Figure 1 is a longitudinal section illustrating one application of my invention, and

Figure 2, a section on line 2--2 of F ig. 1.

In the drawings reference character indicates a casing which in the present instance is shown as cylindrical but which may be made in any other desired forni. ing is formed of a single sleeve and is provided with front and rear closure plates 11 and 12 for the normal inlet and discharge of the exhaust gases of an internal combustion engine. The closure plate 11 is provi/ded with an opening in which is disposed a pipe 13 which connects directly to the exhaust pipe of the motor and such pipe extends into the casing 10 concentrically of the same and ter minates substantially at the middle of the casing andvh'as its end closed by means of an imperforate disc 14. rllhe portion of the pipe 13 which is disposed within the casing 10 is provided with a plurality of longitudinal slots 15 and a plurality of cylindrical openings 16 which permit the discharge of the products of combustion' from the pipe 13 into the chamber around the pipe within the casing 10.

A smaller pipe 17 is secured to the disc 14 in alignment with the pipe 13 and therear end of the pipe extends through the end plate 12 which closes the rear end of the casing and terminates in a discharge opening or extremity 18. The pipe 17 is provided at its forward ortion with a plurality of slots 19 and circu er openings 20 to permit the prod- The casucts of combustion to pass into the pipe and be discharged through the end 18 into the atmosphere, the mulfling action being caused by the passage of the exhaust gases from the pipe 13 into the casing l0 and from the casing 10 into the pipe 17 from which it is discharged.

In order to relieve excessive pressure and to prevent back firing of the motor from rup'- turing the muffler I provide large discharge openings 21 in the sleeve or casing 10 and a valve seat 22 located ahead of the openings 21 with a slidable plate valve 23 normally held against the valve seat 22 by means of a spring 24 which is disposed around the pipe f 17, the spring 24 being secured at its rear end to the end plate 12 and at its front end to the valve plate 23. Thus it will be necessary for v the valve plate 23 to be moved against the action of the spring 24 until it uncovers the openings 21 which will permit the discharge of the exhaust gases from the casing l0 with substantially no interference.

In the construction of my muler I weld the various joints to form a substantial construction devoid of bolts and other parts which permit the device to become loose and rattle.

It will be obvious to those skilled in the art that various changes may be made in my device without departing from the spirit of the invention, and I, therefore, myself to what is shown in the drawings and described in the specification, but only as set forth in the appended claims.

Having thus fully described my said invention, what I claim as new and desire to secure by Letters Patent, is:

1. A muilier comprising a cylindrical casing, a pipe extending through one end of the casing and terminating substantially at the center of the same, an imperforate disc closing the end of the pipe` a second p ipe secured to the imperforate disc extending through the rear end of the muiller, said pipes being provided with openings for permitting the vpassage of the products of combustion, a

valve seat in the casing behind the openings in the second pipe, a plate valve slidable on the second pipe and normally engaging the valve seat, sprin means tending to hold the plate valve on t e valve seat. and openings do not limit from the casing behind the valve seat Whereby when the valve is opened a predetermined amount it will permit discharge directly from the casing, substantially as set forth.

2. A muffler comprising a casing provided with openings in its side Wall adjacent its rear end, a valve seat in said casing forwardly of said openings, a plate valve for co-operation with said seat, spring means for holding the valve against the seat but permitting -the same to move longitudinally of the casing to uncover thc valve seat and clear the openings upon the accumulation of excess pressure in the forward end of the casing, an inlet pipe extending into one end of the casing and a separate discharge pipe extending from the other end lof the casing, substantially as set forth. y

3. A muffler comprising a casing provided with openings in its side wall adjacent its rear end, a valve seat in said casing forwardly of said openings, a plate valve for co-operation with said seat, spring means for holding the valve against the seat but permitting the same to move longitudinally of the casing to uncover the valve seat and clear the openings upon the accumulation of excess pressure in the forward end ofthe casing, an inlet pipe` extending luto the forward portlon of the cas.

ing and having perforations in the same with- 1n the caslng, a closure for the rear end of said pipe, and a discharge plpe of reduced .size extending from the rear portion of the l muffler and provided With inlet orifices in its forward portion, substantially as set forth. Y In Witness whereof, I have hereunto set my hand at New Albany, Indiana this tenth day of November, A. D. ninteen hundred and twenty-eight.

FRANCIS E. KERSEY. 

